=0.928=92.8% 3)驱动液压泵所需的电动机功率等于液压泵的输入功率: P=p×q t =30 ×10 6×160 ×10 -3 =80 ×10 3 (W)=80(kW) 六、综合题下图所示回路可实行“快进——工进――快退――原位停止和液压泵卸荷”的工作循环,完成电磁铁动作顺序表(通电“+”,断电“-”) 七、综合题某机床进给回路如图所示,它可以实现快进→工进→快退的工作循环。根据此回路工作原理,填写电磁铁动作表。(电磁铁通电时,在空格中记“+”号;反之,断电记“-”号) 电磁铁工作环节 1YA 2YA 3YA 快进+-+ 1YA 2YA 3YA 4YA 快进+--+ 工进+-++ 快退-+-+ 原位停止,泵卸荷--__ 工进+-- 快退-+- province. It isa mellow tea that will go perfectly with the rich little nuggets, and will warm you up ona cold afternoon. Incidentally, the general guide is green tea such as Longjing or Dragonwell for the hot season, semi-fermented teas like Wu-long or Iron Buddha for autumn, and more warming teas like Pu ’ er for winter. The Shang-Xi afternoon tea costs 228 yuan ($37) per person, and 388 yuan for the more opulent selection which includes abalone and bird ’s nest.
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